/*

 * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/conf.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/x509v3.h>

#include "crypto/x509.h"

#include "ext_dat.h"

#include "x509_local.h"

static void *v2i_crld(const X509V3_EXT_METHOD *method,

                      X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval);

static int i2r_crldp(const X509V3_EXT_METHOD *method, void *pcrldp, BIO *out,

                     int indent);

const X509V3_EXT_METHOD ossl_v3_crld = {

    NID_crl_distribution_points, 0, ASN1_ITEM_ref(CRL_DIST_POINTS),

    0, 0, 0, 0,

    0, 0,

    0,

    v2i_crld,

    i2r_crldp, 0,

    NULL

};

const X509V3_EXT_METHOD ossl_v3_freshest_crl = {

    NID_freshest_crl, 0, ASN1_ITEM_ref(CRL_DIST_POINTS),

    0, 0, 0, 0,

    0, 0,

    0,

    v2i_crld,

    i2r_crldp, 0,

    NULL

};

static STACK_OF(GENERAL_NAME) *gnames_from_sectname(X509V3_CTX *ctx,

                                                    char *sect)

{

    STACK_OF(CONF_VALUE) *gnsect;

    STACK_OF(GENERAL_NAME) *gens;

    if (*sect == '@')

        gnsect = X509V3_get_section(ctx, sect + 1);

    else

        gnsect = X509V3_parse_list(sect);

    if (!gnsect) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_SECTION_NOT_FOUND);

        return NULL;

    }

    gens = v2i_GENERAL_NAMES(NULL, ctx, gnsect);

    if (*sect == '@')

        X509V3_section_free(ctx, gnsect);

    else

        sk_CONF_VALUE_pop_free(gnsect, X509V3_conf_free);

    return gens;

}

static int set_dist_point_name(DIST_POINT_NAME **pdp, X509V3_CTX *ctx,

                               CONF_VALUE *cnf)

{

    STACK_OF(GENERAL_NAME) *fnm = NULL;

    STACK_OF(X509_NAME_ENTRY) *rnm = NULL;

    if (HAS_PREFIX(cnf->name, "fullname")) {

        fnm = gnames_from_sectname(ctx, cnf->value);

        if (!fnm)

            goto err;

    } else if (strcmp(cnf->name, "relativename") == 0) {

        int ret;

        STACK_OF(CONF_VALUE) *dnsect;

        X509_NAME *nm;

        nm = X509_NAME_new();

        if (nm == NULL)

            return -1;

        dnsect = X509V3_get_section(ctx, cnf->value);

        if (!dnsect) {

            X509_NAME_free(nm);

            ERR_raise(ERR_LIB_X509V3, X509V3_R_SECTION_NOT_FOUND);

            return -1;

        }

        ret = X509V3_NAME_from_section(nm, dnsect, MBSTRING_ASC);

        X509V3_section_free(ctx, dnsect);

        rnm = nm->entries;

        nm->entries = NULL;

        X509_NAME_free(nm);

        if (!ret || sk_X509_NAME_ENTRY_num(rnm) <= 0)

            goto err;

        /*

         * Since its a name fragment can't have more than one RDNSequence

         */

        if (sk_X509_NAME_ENTRY_value(rnm,

                                     sk_X509_NAME_ENTRY_num(rnm) - 1)->set) {

            ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_MULTIPLE_RDNS);

            goto err;

        }

    } else

        return 0;

    if (*pdp) {

        ERR_raise(ERR_LIB_X509V3, X509V3_R_DISTPOINT_ALREADY_SET);

        goto err;

    }

    *pdp = DIST_POINT_NAME_new();

    if (*pdp == NULL)

        goto err;

    if (fnm) {

        (*pdp)->type = 0;

        (*pdp)->name.fullname = fnm;

    } else {

        (*pdp)->type = 1;

        (*pdp)->name.relativename = rnm;

    }

    return 1;

 err:

    sk_GENERAL_NAME_pop_free(fnm, GENERAL_NAME_free);

    sk_X509_NAME_ENTRY_pop_free(rnm, X509_NAME_ENTRY_free);

    return -1;

}

static const BIT_STRING_BITNAME reason_flags[] = {

    {0, "Unused", "unused"},

    {1, "Key Compromise", "keyCompromise"},

    {2, "CA Compromise", "CACompromise"},

    {3, "Affiliation Changed", "affiliationChanged"},

    {4, "Superseded", "superseded"},

    {5, "Cessation Of Operation", "cessationOfOperation"},

    {6, "Certificate Hold", "certificateHold"},

    {7, "Privilege Withdrawn", "privilegeWithdrawn"},

    {8, "AA Compromise", "AACompromise"},

    {-1, NULL, NULL}

};

static int set_reasons(ASN1_BIT_STRING **preas, char *value)

{

    STACK_OF(CONF_VALUE) *rsk = NULL;

    const BIT_STRING_BITNAME *pbn;

    const char *bnam;

    int i, ret = 0;

    rsk = X509V3_parse_list(value);

    if (rsk == NULL)

        return 0;

    if (*preas != NULL)

        goto err;

    for (i = 0; i < sk_CONF_VALUE_num(rsk); i++) {

        bnam = sk_CONF_VALUE_value(rsk, i)->name;

        if (*preas == NULL) {

            *preas = ASN1_BIT_STRING_new();

            if (*preas == NULL)

                goto err;

        }

        for (pbn = reason_flags; pbn->lname; pbn++) {

            if (strcmp(pbn->sname, bnam) == 0) {

                if (!ASN1_BIT_STRING_set_bit(*preas, pbn->bitnum, 1))

                    goto err;

                break;

            }

        }

        if (pbn->lname == NULL)

            goto err;

    }

    ret = 1;

 err:

    sk_CONF_VALUE_pop_free(rsk, X509V3_conf_free);

    return ret;

}

static int print_reasons(BIO *out, const char *rname,

                         ASN1_BIT_STRING *rflags, int indent)

{

    int first = 1;

    const BIT_STRING_BITNAME *pbn;

    BIO_printf(out, "%*s%s:\n%*s", indent, "", rname, indent + 2, "");

    for (pbn = reason_flags; pbn->lname; pbn++) {

        if (ASN1_BIT_STRING_get_bit(rflags, pbn->bitnum)) {

            if (first)

                first = 0;

            else

                BIO_puts(out, ", ");

            BIO_puts(out, pbn->lname);

        }

    }

    if (first)

        BIO_puts(out, "<EMPTY>\n");

    else

        BIO_puts(out, "\n");

    return 1;

}

static DIST_POINT *crldp_from_section(X509V3_CTX *ctx,

                                      STACK_OF(CONF_VALUE) *nval)

{

    int i;

    CONF_VALUE *cnf;

    DIST_POINT *point = DIST_POINT_new();

    if (point == NULL)

        goto err;

    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {

        int ret;

        cnf = sk_CONF_VALUE_value(nval, i);

        ret = set_dist_point_name(&point->distpoint, ctx, cnf);

        if (ret > 0)

            continue;

        if (ret < 0)

            goto err;

        if (strcmp(cnf->name, "reasons") == 0) {

            if (!set_reasons(&point->reasons, cnf->value))

                goto err;

        } else if (strcmp(cnf->name, "CRLissuer") == 0) {

            point->CRLissuer = gnames_from_sectname(ctx, cnf->value);

            if (point->CRLissuer == NULL)

                goto err;

        }

    }

    return point;

 err:

    DIST_POINT_free(point);

    return NULL;

}

static void *v2i_crld(const X509V3_EXT_METHOD *method,

                      X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval)

{

    STACK_OF(DIST_POINT) *crld;

    GENERAL_NAMES *gens = NULL;

    GENERAL_NAME *gen = NULL;

    CONF_VALUE *cnf;

    const int num = sk_CONF_VALUE_num(nval);

    int i;

    crld = sk_DIST_POINT_new_reserve(NULL, num);

    if (crld == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);

        goto err;

    }

    for (i = 0; i < num; i++) {

        DIST_POINT *point;

        cnf = sk_CONF_VALUE_value(nval, i);

        if (cnf->value == NULL) {

            STACK_OF(CONF_VALUE) *dpsect;

            dpsect = X509V3_get_section(ctx, cnf->name);

            if (!dpsect)

                goto err;

            point = crldp_from_section(ctx, dpsect);

            X509V3_section_free(ctx, dpsect);

            if (point == NULL)

                goto err;

            sk_DIST_POINT_push(crld, point); /* no failure as it was reserved */

        } else {

            if ((gen = v2i_GENERAL_NAME(method, ctx, cnf)) == NULL)

                goto err;

            if ((gens = GENERAL_NAMES_new()) == NULL) {

                ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

                goto err;

            }

            if (!sk_GENERAL_NAME_push(gens, gen)) {

                ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);

                goto err;

            }

            gen = NULL;

            if ((point = DIST_POINT_new()) == NULL) {

                ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

                goto err;

            }

            sk_DIST_POINT_push(crld, point); /* no failure as it was reserved */

            if ((point->distpoint = DIST_POINT_NAME_new()) == NULL) {

                ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

                goto err;

            }

            point->distpoint->name.fullname = gens;

            point->distpoint->type = 0;

            gens = NULL;

        }

    }

    return crld;

 err:

    GENERAL_NAME_free(gen);

    GENERAL_NAMES_free(gens);

    sk_DIST_POINT_pop_free(crld, DIST_POINT_free);

    return NULL;

}

static int dpn_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,

                  void *exarg)

{

    DIST_POINT_NAME *dpn = (DIST_POINT_NAME *)*pval;

    switch (operation) {

    case ASN1_OP_NEW_POST:

        dpn->dpname = NULL;

        break;

    case ASN1_OP_FREE_POST:

        X509_NAME_free(dpn->dpname);

        break;

    }

    return 1;

}

ASN1_CHOICE_cb(DIST_POINT_NAME, dpn_cb) = {

        ASN1_IMP_SEQUENCE_OF(DIST_POINT_NAME, name.fullname, GENERAL_NAME, 0),

        ASN1_IMP_SET_OF(DIST_POINT_NAME, name.relativename, X509_NAME_ENTRY, 1)

} ASN1_CHOICE_END_cb(DIST_POINT_NAME, DIST_POINT_NAME, type)

IMPLEMENT_ASN1_FUNCTIONS(DIST_POINT_NAME)

ASN1_SEQUENCE(DIST_POINT) = {

        ASN1_EXP_OPT(DIST_POINT, distpoint, DIST_POINT_NAME, 0),

        ASN1_IMP_OPT(DIST_POINT, reasons, ASN1_BIT_STRING, 1),

        ASN1_IMP_SEQUENCE_OF_OPT(DIST_POINT, CRLissuer, GENERAL_NAME, 2)

} ASN1_SEQUENCE_END(DIST_POINT)

IMPLEMENT_ASN1_FUNCTIONS(DIST_POINT)

ASN1_ITEM_TEMPLATE(CRL_DIST_POINTS) =

        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, CRLDistributionPoints, DIST_POINT)

ASN1_ITEM_TEMPLATE_END(CRL_DIST_POINTS)

IMPLEMENT_ASN1_FUNCTIONS(CRL_DIST_POINTS)

ASN1_SEQUENCE(ISSUING_DIST_POINT) = {

        ASN1_EXP_OPT(ISSUING_DIST_POINT, distpoint, DIST_POINT_NAME, 0),

        ASN1_IMP_OPT(ISSUING_DIST_POINT, onlyuser, ASN1_FBOOLEAN, 1),

        ASN1_IMP_OPT(ISSUING_DIST_POINT, onlyCA, ASN1_FBOOLEAN, 2),

        ASN1_IMP_OPT(ISSUING_DIST_POINT, onlysomereasons, ASN1_BIT_STRING, 3),

        ASN1_IMP_OPT(ISSUING_DIST_POINT, indirectCRL, ASN1_FBOOLEAN, 4),

        ASN1_IMP_OPT(ISSUING_DIST_POINT, onlyattr, ASN1_FBOOLEAN, 5)

} ASN1_SEQUENCE_END(ISSUING_DIST_POINT)

IMPLEMENT_ASN1_FUNCTIONS(ISSUING_DIST_POINT)

static int i2r_idp(const X509V3_EXT_METHOD *method, void *pidp, BIO *out,

                   int indent);

static void *v2i_idp(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,

                     STACK_OF(CONF_VALUE) *nval);

const X509V3_EXT_METHOD ossl_v3_idp = {

    NID_issuing_distribution_point, X509V3_EXT_MULTILINE,

    ASN1_ITEM_ref(ISSUING_DIST_POINT),

    0, 0, 0, 0,

    0, 0,

    0,

    v2i_idp,

    i2r_idp, 0,

    NULL

};

static void *v2i_idp(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,

                     STACK_OF(CONF_VALUE) *nval)

{

    ISSUING_DIST_POINT *idp = NULL;

    CONF_VALUE *cnf;

    char *name, *val;

    int i, ret;

    idp = ISSUING_DIST_POINT_new();

    if (idp == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

        goto err;

    }

    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {

        cnf = sk_CONF_VALUE_value(nval, i);

        name = cnf->name;

        val = cnf->value;

        ret = set_dist_point_name(&idp->distpoint, ctx, cnf);

        if (ret > 0)

            continue;

        if (ret < 0)

            goto err;

        if (strcmp(name, "onlyuser") == 0) {

            if (!X509V3_get_value_bool(cnf, &idp->onlyuser))

                goto err;

        } else if (strcmp(name, "onlyCA") == 0) {

            if (!X509V3_get_value_bool(cnf, &idp->onlyCA))

                goto err;

        } else if (strcmp(name, "onlyAA") == 0) {

            if (!X509V3_get_value_bool(cnf, &idp->onlyattr))

                goto err;

        } else if (strcmp(name, "indirectCRL") == 0) {

            if (!X509V3_get_value_bool(cnf, &idp->indirectCRL))

                goto err;

        } else if (strcmp(name, "onlysomereasons") == 0) {

            if (!set_reasons(&idp->onlysomereasons, val))

                goto err;

        } else {

            ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NAME);

            X509V3_conf_add_error_name_value(cnf);

            goto err;

        }

    }

    return idp;

 err:

    ISSUING_DIST_POINT_free(idp);

    return NULL;

}

static int print_gens(BIO *out, STACK_OF(GENERAL_NAME) *gens, int indent)

{

    int i;

    for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {

        if (i > 0)

            BIO_puts(out, "\n");

        BIO_printf(out, "%*s", indent + 2, "");

        GENERAL_NAME_print(out, sk_GENERAL_NAME_value(gens, i));

    }

    return 1;

}

static int print_distpoint(BIO *out, DIST_POINT_NAME *dpn, int indent)

{

    if (dpn->type == 0) {

        BIO_printf(out, "%*sFull Name:\n", indent, "");

        print_gens(out, dpn->name.fullname, indent);

    } else {

        X509_NAME ntmp;

        ntmp.entries = dpn->name.relativename;

        BIO_printf(out, "%*sRelative Name:\n%*s", indent, "", indent + 2, "");

        X509_NAME_print_ex(out, &ntmp, 0, XN_FLAG_ONELINE);

        BIO_puts(out, "\n");

    }

    return 1;

}

static int i2r_idp(const X509V3_EXT_METHOD *method, void *pidp, BIO *out,

                   int indent)

{

    ISSUING_DIST_POINT *idp = pidp;

    if (idp->distpoint)

        print_distpoint(out, idp->distpoint, indent);

    if (idp->onlyuser > 0)

        BIO_printf(out, "%*sOnly User Certificates\n", indent, "");

    if (idp->onlyCA > 0)

        BIO_printf(out, "%*sOnly CA Certificates\n", indent, "");

    if (idp->indirectCRL > 0)

        BIO_printf(out, "%*sIndirect CRL\n", indent, "");

    if (idp->onlysomereasons)

        print_reasons(out, "Only Some Reasons", idp->onlysomereasons, indent);

    if (idp->onlyattr > 0)

        BIO_printf(out, "%*sOnly Attribute Certificates\n", indent, "");

    if (!idp->distpoint && (idp->onlyuser <= 0) && (idp->onlyCA <= 0)

        && (idp->indirectCRL <= 0) && !idp->onlysomereasons

        && (idp->onlyattr <= 0))

        BIO_printf(out, "%*s<EMPTY>\n", indent, "");

    return 1;

}

static int i2r_crldp(const X509V3_EXT_METHOD *method, void *pcrldp, BIO *out,

                     int indent)

{

    STACK_OF(DIST_POINT) *crld = pcrldp;

    DIST_POINT *point;

    int i;

    for (i = 0; i < sk_DIST_POINT_num(crld); i++) {

        if (i > 0)

            BIO_puts(out, "\n");

        point = sk_DIST_POINT_value(crld, i);

        if (point->distpoint)

            print_distpoint(out, point->distpoint, indent);

        if (point->reasons)

            print_reasons(out, "Reasons", point->reasons, indent);

        if (point->CRLissuer) {

            BIO_printf(out, "%*sCRL Issuer:\n", indent, "");

            print_gens(out, point->CRLissuer, indent);

        }

    }

    return 1;

}

/* Append any nameRelativeToCRLIssuer in dpn to iname, set in dpn->dpname */

int DIST_POINT_set_dpname(DIST_POINT_NAME *dpn, const X509_NAME *iname)

{

    int i;

    STACK_OF(X509_NAME_ENTRY) *frag;

    X509_NAME_ENTRY *ne;

    if (dpn == NULL || dpn->type != 1)

        return 1;

    frag = dpn->name.relativename;

    X509_NAME_free(dpn->dpname); /* just in case it was already set */

    dpn->dpname = X509_NAME_dup(iname);

    if (dpn->dpname == NULL)

        return 0;

    for (i = 0; i < sk_X509_NAME_ENTRY_num(frag); i++) {

        ne = sk_X509_NAME_ENTRY_value(frag, i);

        if (!X509_NAME_add_entry(dpn->dpname, ne, -1, i ? 0 : 1))

            goto err;

    }

    /* generate cached encoding of name */

    if (i2d_X509_NAME(dpn->dpname, NULL) >= 0)

        return 1;

 err:

    X509_NAME_free(dpn->dpname);

    dpn->dpname = NULL;

    return 0;

}